CN115093025A - Control device and control method for realizing advanced denitrification of municipal sewage by short-cut nitrification treatment of continuous flow AOA (argon oxygen decarburization) process by adding hydroxylamine - Google Patents
Control device and control method for realizing advanced denitrification of municipal sewage by short-cut nitrification treatment of continuous flow AOA (argon oxygen decarburization) process by adding hydroxylamine Download PDFInfo
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Abstract
A control device and a control method for realizing advanced denitrification of municipal sewage by continuous flow AOA process shortcut nitrification by hydroxylamine addition belong to the field of sewage treatment. The device mainly comprises a sewage raw water tank, an AOA bioreactor, a sedimentation tank, a dosing device and a control device. The method comprises the steps that a dosing pump is started to continuously dose hydroxylamine hydrochloride solution into an aerobic zone of an AOA bioreactor by monitoring nitrate nitrogen and nitrite nitrogen generated by the aerobic zone of a system in real time, and the AOB activity is higher than the NOB activity in the nitrification process by utilizing the difference of the inhibition effects of hydroxylamine on the activities of Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB), so that the accumulation of nitrite in the aerobic zone is realized, and the stability of short-range nitrification in the aerobic zone is maintained; finally, the advanced denitrification and even complete denitrification of the municipal sewage are realized in the AOA system based on the post-denitrification. The invention can realize stable short-cut nitrification under extremely low water inlet load, and accords with engineering application conditions in most areas of China.
Description
Technical Field
The invention belongs to the technical field of biological sewage treatment, and particularly relates to a control device and a control method for realizing deep denitrification of municipal sewage by continuous flow AOA process shortcut nitrification by adding hydroxylamine.
Background
Along with the development of social economy, the living standard of people is improved, the problem of water environment pollution is increasingly prominent, water eutrophication caused by excessive discharge of nutrient elements such as nitrogen and phosphorus is one of the main problems of water pollution, and biological treatment is the only economic and efficient choice for removing nitrogen in urban sewage treatment plants.
The conventional biological denitrification process comprises a nitrification process and a denitrification process, wherein the nitrification reaction comprises the steps of oxidizing ammonia nitrogen into nitrite nitrogen and oxidizing the nitrite nitrogen into nitrate nitrogen by Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB) in a step-by-step manner, a large amount of oxygen is required in the whole process, and in the denitrification process, the denitrification bacteria reduce the nitrate nitrogen into nitrite nitrogen and further generate nitrogen, and a large amount of carbon sources are required to be consumed in the whole process. Therefore, the traditional biological denitrification process not only has huge energy consumption, but also has the defect that the nitrogen removal efficiency is difficult to meet the requirement due to insufficient supply of carbon sources in raw water.
The short-cut nitrification aims to inhibit the activity of NOB so as to control the nitrification reaction in the stage of nitrite nitrogen generation and avoid redundant aeration energy consumption and carbon source consumption. The methods for realizing the short-cut nitrification mainly comprise DO control, temperature control, low SRT, FA/FNA inhibition and the like, however, the fluctuation of water quality and water quantity in an actual urban sewage treatment plant is large, and the realization of the short-cut nitrification by the methods is often difficult.
Hydroxylamine is used as an intermediate product of the nitration reaction, and can effectively inhibit the activity of NOB and realize short-cut nitration. The short-cut nitrification is realized by adding hydroxylamine in a continuous flow system for treating low-concentration urban sewage, so that the aeration energy consumption can be saved, the carbon source addition is reduced, the running cost is reduced, and the complete removal of inorganic nitrogen in the sewage can be realized by a biological denitrification process based on the post-denitrification.
Disclosure of Invention
The purpose of the invention is solved by the following technical scheme:
the hydroxylamine is thrown and realize continuous flow AOA technology short-cut nitrification treatment urban sewage degree of depth controlling means who denitrifies, its characterized in that:
comprises a sewage raw water tank (1), an AOA bioreactor (2), a secondary sedimentation tank (3), a dosing device (4) and a control system (5); the AOA bioreactor (2) comprises an anaerobic zone (2.1), an aerobic zone I (2.2.1), an aerobic zone II (2.2.2) and an anoxic zone (2.3) in sequence; the sewage raw water tank (1) is connected with an anaerobic zone (2.1) through a water inlet pump (1.1), the anaerobic zone (2.1), an aerobic first zone (2.2.1), an aerobic second zone (2.2.2) and an anoxic zone (2.3) are sequentially connected, and the anoxic zone (2.3) is connected with a secondary sedimentation tank (3) through an overflow pipe (2.8); the bottom of the secondary sedimentation tank (3) is connected with the initial end (2.1) of the anaerobic zone through a first sludge reflux pump (3.1), the bottom of the secondary sedimentation tank (3) is connected with the initial end of the anoxic zone (2.3) through a second sludge reflux pump (3.2), the effluent of the secondary sedimentation tank (3) is discharged through a drain pipe (3.3), and sludge is periodically discharged from a sludge discharge pipe (3.4); an anaerobic zone (2.1) and an anoxic zone (2.3) in the AOA bioreactor (2) are both provided with stirrers (2.4), an aeration pump (2.5) is connected with an aeration disc (2.7) through a rotameter (2.6) to respectively supply oxygen to the aerobic zone one (2.2.1) and the aerobic zone two (2.2.2), and a nitrate nitrogen determinator (2.9) and a nitrite nitrogen determinator (2.10) are arranged in the aerobic zone two (2.2.2); the drug adding device (4) comprises a dissolving tank (4.1), a drug stirrer (4.2) and a drug adding pump (4.3), hydroxylamine hydrochloride solution is added into an aerobic zone (2.2.1) of the AOA bioreactor (2) through the drug adding pump (4.3), and during the adding period, the drug stirrer (4.2) continuously stirs to keep the solution in the dissolving tank (4.1) uniform; the computer (5.1) is connected with the PLC through the Ethernet, so that the control box (5.2) completes the on-line control of the opening and closing of the medicament stirrer (4.2) and the medicament feeding pump (4.3).
The starting of the AOA process comprises the following steps:
1) firstly, inoculating floc sludge in an AOA bioreactor, wherein the suspended solid concentration (MLSS) of mixed liquor is 2500-4500 mg/L;
2) starting the device at normal temperature, and controlling the volume load of the inlet ammonia nitrogen within 45-60 g/(m) 3 D) controlling the hydraulic retention time of the AOA bioreactor (2) between 10 and 16 h; domestic sewage enters an anaerobic zone (2.1) of an AOA bioreactor (2) from a sewage raw water tank (1) through a first water inlet pump (1.1), meanwhile, partial returned sludge pumped back from the bottom of a secondary sedimentation tank (3) through a first sludge return pump (3.1) enters the anaerobic zone, the return ratio is 50% -100%, the other part of returned sludge enters the anaerobic zone (2.1) from the bottom of the secondary sedimentation tank (3) through a second sludge return pump (3.2), and the return ratio is 50% -150%;
3) the anaerobic/aerobic/anoxic volume ratio is 1:1: 2; the muddy water mixed liquor flows through an anaerobic zone (2.1), phosphorus-accumulating bacteria in the mixed liquor carry out anaerobic phosphorus release, and glycan bacteria store an internal carbon source under anaerobic conditions; the sludge-water mixed liquor sequentially flows through the aerobic first zone (2.2.1) and the aerobic second zone (2.2.2), and the concentration of dissolved oxygen in the aerobic zone (2.2) is controlled to be 0.5-1.5mg/L through a rotameter (2.7); aerobic phosphorus absorption is carried out by phosphorus accumulating bacteria in the floc sludge, and Ammonia Oxidizing Bacteria (AOB) and Nitrite Oxidizing Bacteria (NOB) in the floc sludge oxidize ammonia nitrogen into nitrate nitrogen step by step; sludge-water mixed liquor enters the anoxic zone (2.3) from the aerobic zone (2.2.2) and is mixed with part of returned sludge from the bottom of the secondary sedimentation tank (3) and pumped back by the second sludge return pump (3.2), and glycan bacteria in the mixed liquor in the anoxic zone (2.3) utilize an intracellular carbon source to carry out endogenous denitrification on nitrate nitrogen generated in the aerobic zone (2.2) so as to generate nitrogen and realize the removal of nitrogen in sewage;
4) the mixed liquor enters a secondary sedimentation tank (3) from an anoxic zone (2.4) through an overflow pipe (2.8) to realize the purpose of sludge-water separation, the supernatant in the secondary sedimentation tank (3) is discharged through a drain pipe (3.3), sludge is regularly discharged from the bottom of the secondary sedimentation tank through a sludge discharge pipe (3.4), the suspended solid concentration (MLSS) of the average mixed liquor in the sectional water inlet AOA bioreactor (2) is kept at 2500-.
5) When the total nitrogen removal load of the AOA bioreactor (2) reaches 32-42 g/(m) 3 D), or when the total nitrogen removal rate stably reaches more than 65%, the AOA process is successfully started;
the on-line control of the short-cut nitrification process of the AOA process comprises the following steps:
1) adding hydroxylamine hydrochloride and distilled water into a dissolving tank (4.1), starting a medicament stirrer (4.2) to prepare hydroxylamine hydrochloride mother liquor, adjusting the flow of a medicament adding pump (4.3) to ensure that the initial hydroxylamine concentration after mixing in an aerobic zone (2.2.1) is 2.5-4mg/L, and ensuring that the single-adding duration time is consistent with the hydraulic retention time of an AOA bioreactor (2.2);
2) maintaining the hydraulic retention time of the AOA bioreactor (2), the dissolved oxygen of the aerobic first zone (2.2.1) and the aerobic second zone (2.2.2) and the sludge age unchanged, monitoring and displaying the mass concentration of the nitrate nitrogen and the mass concentration of the nitrite nitrogen of the mixed liquid in the aerobic second zone (2.2.2) in real time by a nitrate nitrogen measuring instrument (2.9) and a nitrite nitrogen measuring instrument (2.10) on line, carrying out calculation and comparative analysis in a control program after the measured values are transmitted to a control box (5.2) through communication, and converting and outputting signals to a medicament stirrer (4.2) and a dosing pump (4.3) if the measured value of the mass concentration of the nitrite nitrogen calculated is less than 4 times of the measured value of the mass concentration of the nitrate nitrogen, so that the hydroxylamine solution is continuously dosed into the aerobic first zone (2.2.1); if the calculated mass concentration measured value of the nitrite nitrogen is more than or equal to 4 times of the mass concentration measured value of the nitrate nitrogen, the control program does not execute any program;
3) in the hydraulic retention time of one AOA bioreactor (2) after the medicament stirrer (4.2) and the dosing pump (4.3) are started and the hydraulic retention time of one AOA bioreactor (2) after the medicament stirrer (4.2) and the dosing pump (4.3) are closed, the nitrate nitrogen determinator (2.9) and the nitrite nitrogen determinator (2.10) are in an off-line state, online monitoring is not carried out, and the control program does not judge the system operation; after the medicine adding device (4) stops running and the AOA bioreactor (2) continues to run for a hydraulic retention time, the nitrate nitrogen determinator (2.9) and the nitrite nitrogen determinator (2.10) start online monitoring again, and the measured value is transmitted to the control box (5.2);
4) under the condition that the nitrite nitrogen concentration in the aerobic second zone (2.2.2) is more than or equal to 4 times of the nitrate nitrogen concentration for 7 days, the volume load of the influent ammonia nitrogen can be increased to 75-90 g/(m) 3 D); when the total nitrogen removal load of the AOA bioreactor (2) reaches 60-75 g/(m) 3 D), or when the total nitrogen removal rate of the system stably reaches more than 85 percent, the device and the control method are successfully applied;
5) maintaining the hydraulic retention time of the AOA bioreactor (2) at 10-16h, the dissolved oxygen of the aerobic first zone (2.2.1) and the aerobic second zone (2.2.2) at 0.5-1.5mg/L and the sludge age of the system unchanged at 15-30d, and keeping the adding system (4) to add hydroxylamine when the measured value of the mass concentration of the nitrite nitrogen is lower than 4 times of the measured value of the mass concentration of the nitrate nitrogen so that the initial hydroxylamine concentration after mixing of the aerobic first zone (2.2.1) is 2.5-4mg/L, and continuing to operate.
The invention has the following advantages:
1) the system realizes the short-cut nitrification process in the system through on-line monitoring control, has high automation degree and convenient operation and management, and maintains stable short-cut nitrification effect in long-term operation;
2) the plug-flow type operation mode is more in line with the use habits of most urban sewage treatment plants, the treatment is high in line with, the operation is convenient, and the subsequent popularization and application of the invention are facilitated;
3) the system belongs to a post-denitrification process, the denitrification principle is based on endogenous denitrification, the complete removal of nitrogen in sewage can be theoretically realized, and the sludge yield is lower compared with that of a pre-denitrification process;
4) hydroxylamine is used as an industrial product, has wide application and is cheap and easy to obtain; the hydroxylamine residue in the effluent can not be generated under the condition of adding a proper amount of the hydroxylamine, and the secondary pollution to the environment can not be caused.
Drawings
FIG. 1 is a control device for realizing deep denitrification of municipal sewage by short-cut nitrification treatment in a continuous flow AOA process by adding hydroxylamine;
FIG. 2 is a control strategy for realizing deep denitrification of municipal sewage by short-cut nitrification treatment in a continuous flow AOA process by adding hydroxylamine.
In fig. 1: 1-a sewage raw water tank, 2-an AOA bioreactor, 3-a secondary sedimentation tank, 4-a dosing device and 5-a control system; 1.1-water inlet pump; 2.1-anaerobic zone, 2.2-aerobic zone, 2.3-anoxic zone, 2.4-agitator, 2.5-aeration pump, 2.6-rotameter, 2.7-aeration disc, 2.8-overflow pipe, 2.9-nitrate nitrogen determinator, 2.10-nitrite nitrogen determinator; 3.1-a first sludge reflux pump, 3.2-a second sludge reflux pump, 3.3-a drain pipe and 3.4-a sludge discharge pipe; 4.1-dissolving tank, 4.2-stirrer, 4.3-dosing pump; 5.1-calculator, 5.2-control cabinet.
Detailed Description
In order to facilitate understanding of the present invention, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It should be understood that the terms "first", "second", etc. are used to describe various information in the present invention, but these terms are only used to distinguish one type of information from another, and the information should not be limited to these terms when actually used. For example, "first" information may also be referred to as "second" information, and "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, an embodiment of the present invention provides a control apparatus and a control method for deep denitrification of municipal sewage by continuous flow AOA process shortcut nitrification treatment with hydroxylamine addition.
A control device and a control method for realizing advanced denitrification of municipal sewage by continuous flow AOA process shortcut nitrification treatment by hydroxylamine addition are characterized in that: comprises a sewage raw water tank (1), an AOA bioreactor (2), a secondary sedimentation tank (3), a dosing device (4) and a control system (5); the AOA bioreactor (2) comprises an anaerobic zone (2.1), an aerobic zone I (2.2.1), an aerobic zone II (2.2.2) and an anoxic zone (2.3) in sequence; the sewage raw water tank (1) is connected with an anaerobic zone (2.1) through a water inlet pump (1.1), the anaerobic zone (2.1), an aerobic first zone (2.2.1), an aerobic second zone (2.2.2) and an anoxic zone (2.3) are sequentially connected, and the anoxic zone (2.3) is connected with a secondary sedimentation tank (3) through an overflow pipe (2.8); the bottom of the secondary sedimentation tank (3) is connected with the initial end (2.1) of the anaerobic zone through a first sludge reflux pump (3.1), the bottom of the secondary sedimentation tank (3) is connected with the initial end of the anoxic zone (2.3) through a second sludge reflux pump (3.2), the effluent of the secondary sedimentation tank (3) is discharged through a drain pipe (3.3), and sludge is periodically discharged from a sludge discharge pipe (3.4); an anaerobic zone (2.1) and an anoxic zone (2.3) in the AOA bioreactor (2) are both provided with stirrers (2.4), an aeration pump (2.5) is connected with an aeration disc (2.7) through a rotameter (2.6) to respectively supply oxygen to the aerobic zone one (2.2.1) and the aerobic zone two (2.2.2), and a nitrate nitrogen determinator (2.9) and a nitrite nitrogen determinator (2.10) are arranged in the aerobic zone two (2.2.2); the drug adding device (4) comprises a dissolving tank (4.1), a drug stirrer (4.2) and a drug adding pump (4.3), hydroxylamine hydrochloride solution is added into an aerobic zone (2.2.1) of the AOA bioreactor (2) through the drug adding pump (4.3), and the drug stirrer (4.2) continuously stirs and keeps the solution in the dissolving tank (4.1) uniform during the adding period; the computer (5.1) is connected with the PLC through the Ethernet, so that the control box (5.2) completes the on-line control of the opening and closing of the medicament stirrer (4.2) and the medicament feeding pump (4.3).
In this example, the sewage treatment amount was 100m 3 /d。
(1) Parameter design:
1) effluent of a rotational flow grit chamber of a sewage treatment plant in Zhongshan City of Guangdong province is taken as a treatment object, the parameters of inlet water quality are shown in a table 1, and the design parameters of an AOA bioreactor (2) are shown in a table 2.
TABLE 1 Water quality index of influent water
TABLE 2AOA bioreactor (2) design parameters
(2) The specific operation is as follows:
starting the AOA process:
1) firstly, inoculating process sludge of an oxidation ditch of a certain sewage treatment plant in Zhongshan City in Guangdong province in an AOA bioreactor (2);
2) starting the device according to design parameters, and sampling and discharging water in and out of the AOA bioreactor (2) at a ratio of 9: 00-10: 00 every day;
3) after starting for 14 days, the COD concentration of the effluent is less than or equal to 30mg/L, NH 4 + -N≤2mg/L，NO 3 - N concentration is less than or equal to 6mg/L, NO 2 - The concentration of N is less than or equal to 0.5mg/L, the concentration of TN of the effluent is less than or equal to 8mg/L, and the TN removal rate is more than or equal to 65 percent, which indicates that the AOA system is successfully started.
On-line control of the shortcut nitrification process:
1) adding hydroxylamine hydrochloride into a dissolving tank (4.1), adding distilled water and starting a medicament stirrer (4.2) to prepare hydroxylamine hydrochloride mother liquor with the concentration of 21.06g/L, namely the concentration of hydroxylamine is 10 g/L;
2) controlling the flow rate of the dosing pump (4.3) to be 2.08L/h to obtain that the initial hydroxylamine concentration in the aerobic zone (2.2) is 2.5mg HA/L, and the daily dosing duration time is 6h consistent with the hydraulic retention time of the AOA bioreactor (2.2);
3) maintaining the hydraulic retention time of the AOA bioreactor (2), the dissolved oxygen of the aerobic first zone (2.2.1) and the aerobic second zone (2.2.2) and the sludge age unchanged, monitoring and displaying the mass concentration of the nitrate nitrogen and the mass concentration of the nitrite nitrogen of the mixed liquid in the aerobic second zone (2.2.2) in real time by a nitrate nitrogen measuring instrument (2.9) and a nitrite nitrogen measuring instrument (2.10) on line, carrying out calculation and comparative analysis in a control program after the measured values are transmitted to a control box (5.2) through communication, and converting and outputting signals to a medicament stirrer (4.2) and a dosing pump (4.3) if the measured value of the mass concentration of the nitrite nitrogen calculated is less than 4 times of the measured value of the mass concentration of the nitrate nitrogen, so that the hydroxylamine solution is continuously dosed into the aerobic first zone (2.2.1); if the calculated measured value of the mass concentration of the nitrite nitrogen is more than or equal to 4 times of the measured value of the mass concentration of the nitrate nitrogen, the control program does not execute any program;
4) in the hydraulic retention time of one AOA bioreactor (2) after the medicament stirrer (4.2) and the dosing pump (4.3) are started and the hydraulic retention time of one AOA bioreactor (2) after the medicament stirrer (4.2) and the dosing pump (4.3) are closed, the nitrate nitrogen determinator (2.9) and the nitrite nitrogen determinator (2.10) are in an off-line state, online monitoring is not carried out, and the control program does not judge the system operation; after the medicine adding device (4) stops running and the AOA bioreactor (2) continues to run for a hydraulic retention time, the nitrate nitrogen determinator (2.9) and the nitrite nitrogen determinator (2.10) start online monitoring again, and a measured value is transmitted to the control box (5.2);
5) the system operates stably for more than 200 days, the mass concentration of nitrite nitrogen in the aerobic second zone (2.2.2) is more than or equal to 4 times of that of nitrate nitrogen, the COD concentration of effluent is less than or equal to 30mg/L, and NH is added 4 + -N≤1mg/L，NO 3 - N concentration is less than or equal to 0.5mg/L, NO 2 - N concentration is less than or equal to 1mg/L, and effluent TNThe concentration is less than or equal to 2.5mg/L, all technical indexes stably reach the first-grade A discharge standard of a municipal sewage treatment plant, and the efficient deep removal of the total nitrogen is realized.
The foregoing is a detailed description of the invention that will enable those skilled in the art to better understand and utilize the invention, and it is not to be limited thereby, since various modifications and changes may be made by those skilled in the art without departing from the scope of the invention.
Claims (3)
1. A hydroxylamine is thrown and realize that continuous flow AOA technology short-cut nitrification treatment municipal sewage degree of depth denitrification's controlling means which characterized in that: comprises a sewage raw water tank (1), an AOA bioreactor (2), a secondary sedimentation tank (3), a dosing device (4) and a control system (5); the AOA bioreactor (2) sequentially comprises an anaerobic zone (2.1), an aerobic first zone (2.2.1), an aerobic second zone (2.2.2) and an anoxic zone (2.3); the sewage raw water tank (1) is connected with an anaerobic zone (2.1) through a water inlet pump (1.1), the anaerobic zone (2.1), an aerobic first zone (2.2.1), an aerobic second zone (2.2.2) and an anoxic zone (2.3) are sequentially connected, and the anoxic zone (2.3) is connected with a secondary sedimentation tank (3) through an overflow pipe (2.8); the secondary sedimentation tank (3) is connected with the anaerobic zone (2.1) through a first sludge reflux pump (3.1), the secondary sedimentation tank (3) is connected with the anoxic zone (2.3) through a second sludge reflux pump (3.2), effluent of the secondary sedimentation tank (3) is discharged through a drain pipe (3.3), and sludge is periodically discharged from a sludge discharge pipe (3.4); an anaerobic zone (2.1) and an anoxic zone (2.3) in the AOA bioreactor (2) are both provided with stirrers (2.4), an aeration pump (2.5) is connected with an aeration disc (2.7) through a rotameter (2.6) to respectively supply oxygen to the aerobic zone one (2.2.1) and the aerobic zone two (2.2.2), and a nitrate nitrogen determinator (2.9) and a nitrite nitrogen determinator (2.10) are arranged in the aerobic zone two (2.2.2); the drug adding device (4) comprises a dissolving tank (4.1), a drug stirrer (4.2) and a drug adding pump (4.3), hydroxylamine hydrochloride solution is added into an aerobic zone (2.2.1) of the AOA bioreactor (2) through the drug adding pump (4.3), and the drug stirrer (4.2) continuously stirs and keeps the solution in the dissolving tank (4.1) uniform during the adding period; the computer (5.1) is connected with the PLC through the Ethernet, so that the control box (5.2) completes the on-line control of the opening and closing of the medicament stirrer (4.2) and the medicament feeding pump (4.3).
2. Method for applying the device according to claim 1, characterized in that the initiation comprises the steps of:
1) firstly, inoculating floc sludge in an AOA bioreactor, wherein the suspended solid concentration MLSS of the mixed solution is 2500-4500 mg/L;
2) starting the device, and controlling the volume load of the ammonia nitrogen in the inlet water to be 45-60 g/(m) 3 D) controlling the hydraulic retention time of the AOA bioreactor (2) to be between 10 and 16 h; domestic sewage enters an anaerobic zone (2.1) of an AOA bioreactor (2) from a sewage raw water tank (1) through a first water inlet pump (1.1), and simultaneously enters partial returned sludge from the bottom of a secondary sedimentation tank (3) and pumped back through a first sludge return pump (3.1), wherein the return ratio is 50-100%, and the other part of returned sludge enters the anaerobic zone (2.1) from the bottom of the secondary sedimentation tank (3) through a second sludge return pump (3.2), and the return ratio is 50-150%;
3) the anaerobic/aerobic/anoxic volume ratio is 1:1: 2; the muddy water mixed liquor flows through an anaerobic zone (2.1), phosphorus-accumulating bacteria in the mixed liquor carry out anaerobic phosphorus release, and glycan bacteria store an internal carbon source under anaerobic conditions; the sludge-water mixed liquid sequentially flows through the aerobic first zone (2.2.1) and the aerobic second zone (2.2.2), and the dissolved oxygen concentration of the aerobic zone (2.2) is controlled to be 0.5-1.5mg/L by a rotameter (2.7); aerobic phosphorus absorption is carried out on the phosphorus accumulating bacteria in the floc sludge, and ammonia nitrogen is oxidized into nitrate nitrogen by ammonia oxidizing bacteria AOB and nitrite oxidizing bacteria NOB in the floc sludge step by step; sludge-water mixed liquor enters the anoxic zone (2.3) from the aerobic zone (2.2.2) and is mixed with part of returned sludge from the bottom of the secondary sedimentation tank (3) and pumped back by the second sludge return pump (3.2), and glycan bacteria in the mixed liquor in the anoxic zone (2.3) utilize an intracellular carbon source to carry out endogenous denitrification on nitrate nitrogen generated in the aerobic zone (2.2) so as to generate nitrogen and realize the removal of nitrogen in sewage;
4) the mixed liquor enters a secondary sedimentation tank (3) from an anoxic zone (2.4) through an overflow pipe (2.8) to realize the purpose of sludge-water separation, the supernatant in the secondary sedimentation tank (3) is discharged through a drain pipe (3.3), sludge is regularly discharged from the bottom of the secondary sedimentation tank through a sludge discharge pipe (3.4), the suspension solid concentration MLSS of the average mixed liquor in the sectional water inlet AOA bioreactor (2) is kept at 2500 plus 4500mg/L, and the sludge age is controlled to be 15-30 d;
5) when AOA biologically reactsThe total nitrogen removal load of the device (2) reaches 32-42 g/(m) 3 D), or the AOA process is successfully started when the total nitrogen removal rate is stabilized to more than 65%.
3. Method for applying the device according to claim 1, characterized in that the online control comprises the steps of:
1) adding hydroxylamine hydrochloride and distilled water into a dissolving tank (4.1), starting a medicament stirrer (4.2) to prepare hydroxylamine hydrochloride mother liquor, adjusting the flow of a medicament adding pump (4.3) to ensure that the initial hydroxylamine concentration after mixing in an aerobic zone (2.2.1) is 2.5-4mg/L, and ensuring that the single-adding duration time is consistent with the hydraulic retention time of an AOA bioreactor (2.2);
2) maintaining the hydraulic retention time of the AOA bioreactor (2), the dissolved oxygen of the aerobic first zone (2.2.1) and the dissolved oxygen of the aerobic second zone (2.2.2) and the sludge age unchanged, monitoring and displaying the mass concentration of the nitrate nitrogen and the mass concentration of the nitrite nitrogen in the mixed liquid in the aerobic second zone (2.2.2) in real time by a nitrate nitrogen measuring instrument (2.9) and a nitrite nitrogen measuring instrument (2.10) on line, carrying out calculation and comparative analysis in a control program after the measured value is transmitted to a control box (5.2) through communication, and if the measured value of the mass concentration of the nitrite nitrogen calculated is less than 4 times of the measured value of the mass concentration of the nitrate nitrogen, converting and outputting a signal to a medicament stirrer (4.2) and a medicament adding pump (4.3) to ensure that hydroxylamine solution is continuously added into the aerobic first zone (2.2.1); if the calculated measured value of the mass concentration of the nitrite nitrogen is more than or equal to 4 times of the measured value of the mass concentration of the nitrate nitrogen, the control program does not execute any program;
3) in the hydraulic retention time of one AOA bioreactor (2) after the medicament stirrer (4.2) and the medicament feeding pump (4.3) are started and the hydraulic retention time of one AOA bioreactor (2) after the medicament stirrer (4.2) and the medicament feeding pump (4.3) are closed, the nitrate nitrogen determinator (2.9) and the nitrite nitrogen determinator (2.10) are in an off-line state, online monitoring is not carried out, and a control program does not judge the operation of the system; after the medicine adding device (4) stops running and the AOA bioreactor (2) continues to run for a hydraulic retention time, the nitrate nitrogen determinator (2.9) and the nitrite nitrogen determinator (2.10) start online monitoring again, and the measured value is transmitted to the control box (5.2);
4) under the condition that the nitrite nitrogen concentration in the aerobic second zone (2.2.2) is more than or equal to 4 times of the nitrate nitrogen concentration for 7 days, the volume load of the influent ammonia nitrogen is increased to 75-90 g/(m) 3 D); when the total nitrogen removal load of the AOA bioreactor (2) reaches 60-75 g/(m) 3 D), or the total nitrogen removal rate stably reaches more than 85 percent, and the method is considered to be successfully applied;
5) maintaining the hydraulic retention time of the AOA bioreactor (2) at 10-16h, the dissolved oxygen of the aerobic first zone (2.2.1) and the aerobic second zone (2.2.2) at 0.5-1.5mg/L and the sludge age of the system at 15d-30d, and keeping the dosing system (4) to perform hydroxylamine dosing when the measured value of the mass concentration of the nitrite nitrogen is lower than 4 times that of the mass concentration of the nitrate nitrogen, so that the initial hydroxylamine concentration after mixing of the aerobic first zone (2.2.1) is 2.5-4mg/L, and continuing to operate.
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| CN116553725A (en) * | 2023-04-11 | 2023-08-08 | 深圳市水务(集团)有限公司 | AOA system and method for low-carbon-nitrogen-ratio urban sewage treatment |
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